CN102691296A - Pipe pile foundation for static-pressure grouting on pile side and rotary jet grouting at pile bottom and construction method thereof - Google Patents
Pipe pile foundation for static-pressure grouting on pile side and rotary jet grouting at pile bottom and construction method thereof Download PDFInfo
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- CN102691296A CN102691296A CN2012101614317A CN201210161431A CN102691296A CN 102691296 A CN102691296 A CN 102691296A CN 2012101614317 A CN2012101614317 A CN 2012101614317A CN 201210161431 A CN201210161431 A CN 201210161431A CN 102691296 A CN102691296 A CN 102691296A
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- Prior art keywords
- pile
- pipe
- grouting
- pressure
- stake
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- 238000010276 construction Methods 0.000 title claims abstract description 20
- 239000011513 prestressed concrete Substances 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 16
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Abstract
The invention discloses a pipe pile foundation for static-pressure grouting on a pile side and high-pressure rotary jet grouting at a pile bottom and a construction method of the pipe pile foundation. The pipe pile foundation comprises a prestressed concrete pipe pile, a reinforced graphite packing sealing gasket, a pile shoe and a pile bottom high-pressure rotary jet grouting reinforcing body, wherein a grouting pipe is embedded in a pile body of the prestressed concrete pipe pile, and the prestressed concrete pipe pile is connected with and seals the grouting pipe embedded in the pile body corresponding to an upper-section pipe pile and a lower-section pipe pile through a reinforced graphite packing sealing gasket; the pile shoe is connected with the lower end of the lowest-section pipe pile of the pipe pile foundation; the grouting pipe embedded in the pile body is reasonably provided with stock outlets in the connection position of the pipe pile and the pile shoe and the connection position of the upper-section pipe pile and the lower-section pipe pile; and one end of the grouting pipe embedded in the pile body is connected to a high-pressure grouting pump. The pipe pile foundation for static-pressure grouting on the pile side and high-pressure rotary jet grouting at the pile bottom and the construction method thereof, provided by the invention, are especially suitable for filed construction of prestressed concrete pipe pile foundations with poorer geological conditions and deep bed rock embedment, and can effectively reduce the length of a pipe pile, and meanwhile the bearing capacity of the pipe pile foundation is ensured, and thus the construction method is simple and reliable.
Description
Technical field
The present invention relates to the pipe pile construction method in a kind of pile foundation field, belong to traffic and civil construction project technical field, particularly relate to the pipe pile foundation and the job practices thereof of high pressure jet grouting at the bottom of the stake of a kind of side static pressure grouting.
Background technology
Drilling follow pile tube (CN2007100290235) is a kind of new stake type; Combine the advantage of hand excavated pile, brill (dashing) hole pouring pile, pile for prestressed pipe;, speed of application strong to geological conditions compliance is fast, reliable in quality, material consumption are few, bearing capacity height of stake, mechanized, nothing construction mud emission problem, protects environment.One of advantage of this type is that it can embed basement rock, gives full play to end resistance, significantly improves the bearing capacity of pipe pile foundation.But the place relatively poor at geological conditions and buried bedrock is darker, if the designing requirement pile tube embeds basement rock, and draw ratio then can't give full play to end resistance when big, caused waste.
, can at the bottom of stake, form the pile body enlarged footing and add solid raising end resistance than heavy back layer construction pipe pile foundation for soft layer, improve the stake side skin friction in the stake side through static pressure grouting, with the bearing capacity of effective raising pipe pile foundation through high pressure jet grouting.It is long that this job practices can shorten stake effectively, improves pile bearing capacity, reduces construction costs.
But the drilling follow pipe pile foundation of prior art and construction technology thereof still have further improved necessity.
Summary of the invention
Based on the deficiency of prior art, the object of the present invention is to provide the pipe pile foundation of high pressure jet grouting at the bottom of the stake of a kind of side static pressure grouting.
Another object of the present invention is to provide a kind of job practices of aforementioned tube pile foundation; It can form the pile tube expanded bore pile through high pressure jet grouting at the bottom of stake and improve end resistance; Improve pile side friction in the stake side through static pressure grouting, reach the effect that improves the pipe pile foundation bearing capacity.
The present invention realizes through following technical scheme.Pipe pile foundation according to high pressure jet grouting at the bottom of a kind of the side static pressure grouting stake of the present invention's proposition; The prestressed concrete pipe pile, enhancing graphite packing sealing mat, shoe and the stake end high pressure jet grouting that comprise the pre-buried Grouting Pipe of pile body add solid, and an end of the pre-buried Grouting Pipe of said pile body is connected to high-pressure injection pump; Said prestressed concrete pipe pile is through strengthening connection of graphite packing sealing mat and the sealing pre-buried Grouting Pipe of the corresponding pile body of pipe joint stake up and down; Said shoe is connected with the lower end of pipe pile foundation foot one pipe joint stake; The pre-buried Grouting Pipe of said pile body rationally is provided with grout outlet at pile tube and shoe junction, tubular pile body.
Said prestressed concrete pipe pile pile body symmetry is embedded with some Grouting Pipe, and Grouting Pipe penetrates end plate, and keeps unimpeded.
The position of corresponding Grouting Pipe is provided with an internal diameter and equates that with the Grouting Pipe external diameter external diameter is a bit larger tham the groove of Grouting Pipe external diameter on the said prestressed concrete pipe pile end plate, is used for placing strengthening the graphite packing sealing mat.
Said shoe is that external diameter is a bit larger tham the pile tube external diameter, equate with the pile tube internal diameter with pile tube link internal diameter, other end internal diameter greater than the pile tube internal diameter less than the bullet of pile tube external diameter.
Said grout outlet should rationally be provided with according to the pile tube joint number, generally at pile tube and shoe junction several grout outlets is set, and tubular pile body is provided with several grout outlets.
Also be connected with the pressure meter that is used to measure grouting pressure on the said high-pressure injection pump.
In addition, the present invention also provides the pipe pile foundation job practices of high pressure jet grouting at the bottom of the stake of a kind of side static pressure grouting, may further comprise the steps:
A) shoe is welded on the end plate of pile tube.
B) grout outlet rationally is set.
The pile tube stake point that c) will weld shoe adopts hammering, static pressure or drilling follow pipe construction prestressed concrete pipe pile straight down.
D) prestressed concrete pipe pile construction utilizes high-pressure rotary-spray equipment water spray, jet to projected depth, the native slag on the cleaning pile tube inwall;
E) utilize high-pressure rotary-spray equipment, through the stake core to the pile tube stake at the bottom of the soil body (slag) high pressure jet grouting in the certain limit reinforce;
F) after the rotary jet strengthening body reaches certain intensity at the bottom of the stake, utilize high-pressure injection pump to pass through the pre-buried Grouting Pipe of pile body to pile tube bottom and stake side high pressure pouring cement paste.
In the step e); At tube pile construction after projected depth; In the soil layer of certain depth, a stake end high pressure jet grouting that forms through high pressure jet grouting adds solid at the bottom of piercing Grouting Pipe through the stake core, and high-pressure rotary-spray can adopt single pipe method, double-tube method or three pipe methods according to geological conditions.
By technique scheme, the advantage that the present invention has is following:
The pipe pile foundation and the job practices thereof of high pressure jet grouting at the bottom of the stake side static pressure grouting provided by the invention stake; It is relatively poor to be specially adapted to geological conditions; The place construction pre-stressed concrete pipe pile foundation that buried bedrock is dark; Can effectively reduce the length of pile tube, improve the bearing capacity of pipe pile foundation, job practices is simple and reliable.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment of the pipe pile foundation of high pressure jet grouting at the bottom of the stake side static pressure grouting of the present invention stake.
Fig. 2 is the sectional drawing of pile tube among Fig. 1.
Fig. 3 is the sectional view of pile tube among Fig. 1.
Fig. 4 is the sectional drawing of shoe among Fig. 1.
1: the pre-buried Grouting Pipe 2 of pile body: prestressed concrete pipe pile
3: prestressed concrete pipe pile end plate 4: grout outlet
5: stake end high pressure jet grouting adds solid 6: shoe
7: strengthen graphite packing sealing mat 8: high-pressure injection pump
9: pressure meter 10: high-pressure rotary jetting apparatus
The specific embodiment
In order to make the present invention be more prone to understand, will combine accompanying drawing and concrete preferred embodiment further to set forth characteristic of the present invention and effect thereof below, but the present invention is not limited in following embodiment.
See also shown in Fig. 1 ~ 4; The pipe pile foundation of high pressure jet grouting comprises at the bottom of the stake side static pressure grouting of the present invention stake: the prestressed concrete pipe pile 2 of the pre-buried Grouting Pipe 1 of pile body, enhancing graphite packing sealing mat 7, shoe 6 and a stake end high pressure jet grouting add solid 5, and said prestressed concrete pipe pile 2 is through strengthening 7 connections of graphite packing sealing mat and sealing the pre-buried Grouting Pipe 1 of pipe joint stake 2 corresponding pile bodies up and down.
The pile body symmetry of this prestressed concrete pipe pile 2 is embedded with some Grouting Pipe 1, and Grouting Pipe 1 penetrates end plate 3 and keeps unimpeded, and is as shown in Figure 3.The position of corresponding Grouting Pipe 1 is provided with an internal diameter and equates that with Grouting Pipe 1 external diameter external diameter is a bit larger tham the groove (not shown) of Grouting Pipe 1 external diameter on the end plate of this prestressed concrete pipe pile 2, is used for placing strengthening graphite packing sealing mat 7.
This shoe 6 is connected with the lower end of pile tube 2 basic foot one pipe joint stakes 2.This shoe 6 is a kind of bullet, and its external diameter is a bit larger tham and pile tube 2 external diameters, and an end internal diameter that is connected with pile tube equates with the internal diameter of pile tube 2; The other end internal diameter that this shoe 6 is connected with pile tube greater than the pile tube internal diameter less than the pile tube external diameter, as shown in Figure 4.
The pre-buried Grouting Pipe 1 of this pile body rationally is provided with grout outlet 4 at pile tube 2 and shoe 6 junctions, every joint prestressed concrete pipe pile 2, and is as shown in Figure 1.This grout outlet 4 should rationally be provided with according to the joint number of pile tube 2, generally in the junction of pile tube 2 and shoe 6 several grout outlets is set, and several grout outlets are set on the tubular pile body.
To add solid 5 be after pile tube 2 is constructed projected depth to high pressure jet grouting at the bottom of this; Water spray, gas are cleared up the native slag on pile tube 2 inwalls earlier; At the bottom of utilizing high-pressure rotary jetting apparatus 10 to pierce again in the rock-soil layer of certain depth through the stake core; Destroy foundation soil through high-pressure spray then, inject a cement paste soil mass consolidation formation stake end high pressure jet grouting and add solid, high-pressure rotary-spray can adopt single pipe method, double-tube method or three pipe methods according to geological conditions.One end of the Grouting Pipe 1 that this pile body is pre-buried is connected to high-pressure injection pump 8; On this high-pressure injection pump 8, pressure meter 9 is installed also, is used to measure grouting pressure.
Below be the basic step of the construction technique of the pipe pile foundation of high pressure jet grouting at the bottom of the stake side static pressure grouting of the present invention stake:
A) shoe 6 is welded on the end plate 3 of pile tube 2;
B) grout outlet 4 rationally is set;
Pile tube 2 ends that c) will weld shoe 6 adopt hammering, static pressure or drilling follow pipe construction prestressed concrete pipe pile 2 straight down;
D) prestressed concrete pipe pile 2 is constructed to projected depth, the native slag on water spray, liquid honing pile tube 2 inwalls;
E) utilize high-pressure rotary jetting apparatus 10 soil body high-pressure slip-casting in the certain limit at the bottom of 2 of the pile tubes to be reinforced through the stake core;
F) utilize high-pressure injection pump 8 to pass through the pre-buried Grouting Pipe 1 of pile body to pile tube 2 bottoms and stake side high pressure pouring cement paste.
Through above-mentioned five steps; The pipe pile foundation and the job practices thereof of high pressure jet grouting at the bottom of the stake side static pressure grouting provided by the invention stake; It is relatively poor to be specially adapted to geological conditions, and construction pre-stressed concrete pipe pile foundation in the dark place of buried bedrock can effectively reduce the length of pile tube; Improve the bearing capacity of pipe pile foundation, job practices is simple and reliable.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Former every technical scheme content of the present invention that do not break away from, all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. the pipe pile foundation of high pressure jet grouting at the bottom of the stake side static pressure grouting stake is characterized in that comprising: the prestressed concrete pipe pile of the pre-buried Grouting Pipe of pile body, strengthen graphite packing sealing mat, shoe and a stake end high pressure jet grouting and add solid;
One end of the pre-buried Grouting Pipe of said pile body is connected to high-pressure injection pump;
Said prestressed concrete pipe pile is through strengthening connection of graphite packing sealing mat and the sealing pre-buried Grouting Pipe of the corresponding pile body of pipe joint stake up and down;
Said shoe is connected with the lower end of pipe pile foundation foot one pipe joint stake;
The pre-buried Grouting Pipe of said pile body rationally is provided with grout outlet at pile tube and shoe junction, tubular pile body.
2. pipe pile foundation according to claim 1 is characterized in that: said prestressed concrete pipe pile pile body symmetry is embedded with some Grouting Pipe, and Grouting Pipe penetrates end plate, and keeps unimpeded.
3. pipe pile foundation according to claim 1; It is characterized in that: the position of corresponding Grouting Pipe is provided with an internal diameter and equates with the Grouting Pipe external diameter on the said prestressed concrete pipe pile end plate; External diameter is a bit larger tham the groove of Grouting Pipe external diameter, is used for placing enhancing graphite packing sealing mat.
4. pipe pile foundation according to claim 1; It is characterized in that: said shoe is the bullet that a kind of external diameter is a bit larger tham the pile tube external diameter; Its end end internal diameter that is connected with pile tube equates with the pile tube internal diameter, the other end internal diameter that is connected with pile tube greater than the pile tube internal diameter less than the pile tube external diameter.
5. pipe pile foundation according to claim 1 is characterized in that: said grout outlet should rationally be provided with according to the joint number of pile tube, at said pile tube and shoe junction several grout outlets is set, and tubular pile body is provided with several grout outlets.
6. pipe pile foundation according to claim 1 is characterized in that: also be connected with the pressure meter that is used to measure grouting pressure on the said high-pressure injection pump.
7. the job practices of the pipe pile foundation of high pressure jet grouting at the bottom of the stake side static pressure grouting stake is characterized in that may further comprise the steps:
A) shoe is welded on the end plate of pile tube;
B) grout outlet rationally is set;
The pile tube stake point that c) will weld shoe adopts hammering, static pressure or drilling follow pipe construction prestressed concrete pipe pile straight down;
D) prestressed concrete pipe pile construction utilizes high-pressure rotary-spray equipment water spray, jet to projected depth, the native slag on the cleaning pile tube inwall;
E) utilize high-pressure rotary-spray equipment, through the stake core to the pile tube stake at the bottom of the soil body (slag) high pressure jet grouting in the certain limit reinforce;
F) after the rotary jet strengthening body reaches certain intensity at the bottom of the stake, utilize high-pressure injection pump to pass through the pre-buried Grouting Pipe of pile body to pile tube bottom and stake side high pressure pouring cement paste.
8. the job practices of pipe pile foundation according to claim 7; It is characterized in that: in the step a); The position of corresponding Grouting Pipe is provided with an internal diameter and equates with the Grouting Pipe external diameter on the end plate of prestressed concrete pipe pile; External diameter is a bit larger tham the groove of Grouting Pipe external diameter, is used for placing enhancing graphite packing sealing mat.
9. the job practices of pipe pile foundation according to claim 7, it is characterized in that: in the step b), grout outlet rationally is provided with according to the joint number of pile tube, in the junction of pile tube and shoe several grout outlets is set, and tubular pile body is provided with several grout outlets.
10. the job practices of pipe pile foundation according to claim 7; It is characterized in that: in the step e); Utilize the high-pressure rotary-spray rig; Form stake end high pressure jet grouting through pile tube stake core high pressure jet grouting and add solid, high-pressure rotary-spray can adopt single pipe method, double-tube method or three pipe methods according to geological conditions.
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| CN201883435U (en) * | 2010-09-17 | 2011-06-29 | 广州市建筑科学研究院有限公司 | Preburied pipe pile grouting device |
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| CN103866804A (en) * | 2014-03-17 | 2014-06-18 | 龚金京 | Permeating impregnating condensing body reinforcing component formed through being combined with original underground concrete component |
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| CN105041341A (en) * | 2015-08-18 | 2015-11-11 | 山东大学 | Hole opening sealing device used for static pressure permeating rotary grouting of drill hole and using method thereof |
| CN105297735A (en) * | 2015-10-19 | 2016-02-03 | 昆明理工大学 | Post grouting technique in which pile tip is at strong permeable stratum |
| CN105297735B (en) * | 2015-10-19 | 2017-05-10 | 昆明理工大学 | Post grouting technique in which pile tip is at strong permeable stratum |
| CN105804083A (en) * | 2016-05-06 | 2016-07-27 | 同济大学 | Grouting pipeline device, conical special-shaped pile and application method thereof |
| CN106759316A (en) * | 2017-01-05 | 2017-05-31 | 广州市建筑科学研究院新技术开发中心有限公司 | A kind of shoe and its construction method for major diameter drilling follow with pile tube |
| CN106759316B (en) * | 2017-01-05 | 2019-10-08 | 广州市建筑科学研究院新技术开发中心有限公司 | It is a kind of for major diameter drilling follow with the shoe and its construction method of tubular pole |
| CN107299633A (en) * | 2017-07-06 | 2017-10-27 | 江苏现代永昌建设有限公司 | A kind of utilization High-pressure Spiral Spray Technology improves the construction method of the bearing capacity of stake |
| CN108086296A (en) * | 2017-11-20 | 2018-05-29 | 中冶建筑研究总院（深圳）有限公司 | Sound joint injected foundation reinforces engineering method |
| CN108086296B (en) * | 2017-11-20 | 2019-12-31 | 中冶建筑研究总院（深圳）有限公司 | Dynamic and static combined grouting foundation reinforcing construction method |
| CN111139831A (en) * | 2019-11-21 | 2020-05-12 | 中国建筑第四工程局有限公司 | Pile core cleaning method |
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